Lab motion Table E: Average Speeds for Higher Racetrack

Time (Initial) Time (Final) Elapsed Time Average speed

(s) (s) (s) (m/s)

1st ¼ of the Track

2nd ¼ of the Track

3rd ¼ of the Track

Final ¼ of the Track

The mentor is usually a peer of the individual that acts as a role model and the individual get started in adult life.

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.

The sun’s mass is 2.0×10^ 30 kg, its radius is 7.0×10 5 km, and it has a rotational period of approximately 28 days. if the sun should collapse into a white dwarf of radius 3.5×10 3 km, what would its period be if no mass were ejected and a sphere of uniform density can model the sun both before and after?